Content-Type: text/html; charset=UTF-8 Double Star Calculator - Orbital Elements

Double Star Calculator - Orbit

- Revision:		$Rev: 1216 $
- Report created:		2025-07-11 18:32:56

Orbital Elements for STF1989

WDS:	STF1989	WDS ID/Discoverer
P:	171.620	Orbital period (years)
a:	0.464	Semi-major axis (arcseconds)
i:	135.2	Inclination (degrees)
Ω:	123.4	Longitude of ascending node (degrees)
T:	1904.150	Epoch of periastron passage (year)
e:	0.961	Eccentricity
ω:	274.0	Longitude of periastron (degrees)
Start-Year:	1940.0	Year
End-Year:	2110.0	Year
Epoch:	2025.0	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for STF1989

Position:	153938.61+795859.6	Epoch-2000 right ascension and declination
WDS-ID:	15396+7959	WDS designation
Discoverer Code:	STF1989	Discover designation and components
ADS number:	9769	Aitken Double Star catalog
HD number:	141652	HD catalog number
Hipparcos number:	76695	Hipparcos catalog number
V1:	7.32	Magnitude of the primary
V2:	8.15	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2004	Date of last observation
Orbit grade:	3	Orbit grade, ranging from 1 'definitive' to 5 'indeterminate'
Flags:	n	Flags

Double Star Orbit for STF1989

WDS 6th Orbit including measures of STF1989

Image from the USNO WDS 6th Orbit Catalog (see Acknowledgements)

Ephemeris of STF1989

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2025.0     0.583     19.8
-------------------------
1940.0     0.498     40.4
1941.0     0.505     40.0
1942.0     0.511     39.7
1943.0     0.517     39.3
1944.0     0.522     39.0
1945.0     0.528     38.7
1946.0     0.534     38.4
1947.0     0.539     38.1
1948.0     0.544     37.8
1949.0     0.549     37.5
1950.0     0.554     37.2
1951.0     0.559     36.9
1952.0     0.563     36.6
1953.0     0.568     36.3
1954.0     0.572     36.0
1955.0     0.576     35.8
1956.0     0.580     35.5
1957.0     0.584     35.3
1958.0     0.588     35.0
1959.0     0.591     34.7
1960.0     0.595     34.5
1961.0     0.598     34.2
1962.0     0.602     34.0
1963.0     0.605     33.7
1964.0     0.608     33.5
1965.0     0.611     33.3
1966.0     0.613     33.0
1967.0     0.616     32.8
1968.0     0.619     32.6
1969.0     0.621     32.3
1970.0     0.624     32.1
1971.0     0.626     31.9
1972.0     0.628     31.7
1973.0     0.630     31.4
1974.0     0.632     31.2
1975.0     0.634     31.0
1976.0     0.635     30.8
1977.0     0.637     30.5
1978.0     0.638     30.3
1979.0     0.640     30.1
1980.0     0.641     29.9
1981.0     0.642     29.7
1982.0     0.643     29.5
1983.0     0.644     29.3
1984.0     0.645     29.0
1985.0     0.645     28.8
1986.0     0.646     28.6
1987.0     0.646     28.4
1988.0     0.647     28.2
1989.0     0.647     28.0
1990.0     0.647     27.8
1991.0     0.647     27.6
1992.0     0.647     27.3
1993.0     0.647     27.1
1994.0     0.647     26.9
1995.0     0.646     26.7
1996.0     0.646     26.5
1997.0     0.645     26.3
1998.0     0.645     26.1
1999.0     0.644     25.9
2000.0     0.643     25.6
2001.0     0.642     25.4
2002.0     0.641     25.2
2003.0     0.640     25.0
2004.0     0.638     24.8
2005.0     0.637     24.6
2006.0     0.635     24.3
2007.0     0.634     24.1
2008.0     0.632     23.9
2009.0     0.630     23.7
2010.0     0.628     23.5
2011.0     0.626     23.2
2012.0     0.624     23.0
2013.0     0.621     22.8
2014.0     0.619     22.5
2015.0     0.616     22.3
2016.0     0.613     22.1
2017.0     0.611     21.8
2018.0     0.608     21.6
2019.0     0.605     21.4
2020.0     0.601     21.1
2021.0     0.598     20.9
2022.0     0.595     20.6
2023.0     0.591     20.4
2024.0     0.587     20.1
2025.0     0.583     19.8
2026.0     0.579     19.6
2027.0     0.575     19.3
2028.0     0.571     19.1
2029.0     0.567     18.8
2030.0     0.562     18.5
2031.0     0.557     18.2
2032.0     0.553     17.9
2033.0     0.548     17.6
2034.0     0.543     17.3
2035.0     0.537     17.0
2036.0     0.532     16.7
2037.0     0.526     16.4
2038.0     0.520     16.1
2039.0     0.514     15.8
2040.0     0.508     15.4
2041.0     0.502     15.1
2042.0     0.495     14.7
2043.0     0.489     14.3
2044.0     0.482     14.0
2045.0     0.475     13.6
2046.0     0.467     13.2
2047.0     0.460     12.8
2048.0     0.452     12.3
2049.0     0.444     11.9
2050.0     0.436     11.4
2051.0     0.427     11.0
2052.0     0.419     10.5
2053.0     0.410     10.0
2054.0     0.400      9.4
2055.0     0.391      8.9
2056.0     0.381      8.3
2057.0     0.371      7.6
2058.0     0.360      7.0
2059.0     0.349      6.3
2060.0     0.338      5.5
2061.0     0.326      4.7
2062.0     0.314      3.8
2063.0     0.301      2.9
2064.0     0.287      1.9
2065.0     0.273      0.7
2066.0     0.259    359.5
2067.0     0.243    358.1
2068.0     0.227    356.5
2069.0     0.209    354.6
2070.0     0.191    352.4
2071.0     0.170    349.7
2072.0     0.148    346.2
2073.0     0.123    341.3
2074.0     0.094    333.7
2075.0     0.055    317.2
2076.0     0.025    136.6
2077.0     0.072     93.0
2078.0     0.103     81.2
2079.0     0.129     74.6
2080.0     0.151     70.0
2081.0     0.172     66.6
2082.0     0.191     63.9
2083.0     0.208     61.7
2084.0     0.225     59.8
2085.0     0.240     58.2
2086.0     0.255     56.7
2087.0     0.269     55.4
2088.0     0.283     54.3
2089.0     0.295     53.2
2090.0     0.308     52.2
2091.0     0.320     51.3
2092.0     0.331     50.5
2093.0     0.343     49.7
2094.0     0.353     49.0
2095.0     0.364     48.3
2096.0     0.374     47.6
2097.0     0.384     47.0
2098.0     0.393     46.4
2099.0     0.402     45.9
2100.0     0.411     45.3
2101.0     0.420     44.8
2102.0     0.428     44.3
2103.0     0.437     43.9
2104.0     0.445     43.4
2105.0     0.452     43.0
2106.0     0.460     42.5
2107.0     0.467     42.1
2108.0     0.474     41.7
2109.0     0.481     41.3

Disclaimer

Acknowledgements

The Double Star Calculator - Orbital Elements makes use of the Washington Double Star Sixth Catalog of Orbits of Visual Binary Stars, maintained at the U.S. Naval Observatory.